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Loans and allowance for credit losses - Credit Quality Indicators by Class of Financing Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | $ 4,352,490 |
Loans | $ 7,082,959 | $ 4,409,642 | 4,409,642 | $ 3,667,511
Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 57,152 |
Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 4,143,116 |
Loans | 6,586,216 |  | 4,143,116 |
Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 142,511 |
Loans | 364,520 |  | 186,180 |
Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 43,669 |
Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 66,863 |
Loans | 129,073 |  | 80,346 |
Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 13,483 |
Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 1,032,352 |
Loans | 1,346,122 |  | 1,034,036 | 867,083
Commercial and industrial | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 1,684 |
Commercial and industrial | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 946,247 |
Loans | 1,238,409 |  |  |
Commercial and industrial | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Commercial and industrial | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 66,910 |
Loans | 68,367 |  |  |
Commercial and industrial | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 1,224 |
Commercial and industrial | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 19,195 |
Loans | 39,146 |  |  |
Commercial and industrial | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 460 |
Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 548,217 |
Loans | 1,222,220 |  | 551,101 | 556,051
Construction | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 2,884 |
Construction | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 541,201 |
Loans | 1,178,821 |  |  |
Construction | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Construction | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 4,790 |
Loans | 34,684 |  |  |
Construction | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 2,681 |
Construction | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 2,226 |
Loans | 8,703 |  |  |
Construction | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 203 |
Residential real estate | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 691,116 |
Loans | 1,089,270 |  | 710,454 | 555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 19,338 |
Residential real estate | 1-to-4 family mortgage | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 666,177 |
Loans | 1,025,911 |  |  |
Residential real estate | 1-to-4 family mortgage | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | 1-to-4 family mortgage | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 11,380 |
Loans | 39,182 |  |  |
Residential real estate | 1-to-4 family mortgage | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 15,091 |
Residential real estate | 1-to-4 family mortgage | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 13,559 |
Loans | 23,591 |  |  |
Residential real estate | 1-to-4 family mortgage | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 4,247 |
Residential real estate | Residential line of credit |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 221,457 |
Loans | 408,211 |  | 221,530 | 190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 73 |
Residential real estate | Residential line of credit | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 218,086 |
Loans | 396,348 |  |  |
Residential real estate | Residential line of credit | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Residential line of credit | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 1,343 |
Loans | 6,511 |  |  |
Residential real estate | Residential line of credit | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Residential line of credit | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 2,028 |
Loans | 4,756 |  |  |
Residential real estate | Residential line of credit | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 73 |
Residential real estate | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 69,429 |
Loans | 175,676 |  | 69,429 | 75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Multi-family mortgage | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 69,366 |
Loans | 175,619 |  |  |
Residential real estate | Multi-family mortgage | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Multi-family mortgage | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 63 |
Loans | 0 |  |  |
Residential real estate | Multi-family mortgage | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Multi-family mortgage | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 0 |
Loans | 57 |  |  |
Residential real estate | Multi-family mortgage | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Residential real estate | Non-owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 1,598,979 |  |  |
Residential real estate | Non-owner occupied | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 1,448,084 |  |  |
Residential real estate | Non-owner occupied | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 130,100 |  |  |
Residential real estate | Non-owner occupied | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 20,795 |  |  |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 924,841 |  |  |
Commercial real estate | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 828,223 |  |  |
Commercial real estate | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 70,059 |  |  |
Commercial real estate | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 26,559 |  |  |
Commercial real estate | Owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 624,379 |
Loans | 924,841 |  | 630,270 | 493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 5,891 |
Commercial real estate | Owner occupied | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 576,737 |
Commercial real estate | Owner occupied | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Commercial real estate | Owner occupied | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 30,379 |
Commercial real estate | Owner occupied | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 4,535 |
Commercial real estate | Owner occupied | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 17,263 |
Commercial real estate | Owner occupied | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 1,356 |
Commercial real estate | Non-owner occupied |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 910,547 |
Loans | 1,598,979 |  | 920,744 | 700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 10,197 |
Commercial real estate | Non-owner occupied | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 876,670 |
Commercial real estate | Non-owner occupied | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Commercial real estate | Non-owner occupied | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 24,342 |
Commercial real estate | Non-owner occupied | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 6,617 |
Commercial real estate | Non-owner occupied | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 9,535 |
Commercial real estate | Non-owner occupied | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 3,580 |
Consumer and other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 254,993 |
Loans | 317,640 |  | 272,078 | $ 228,853
Consumer and other | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 17,085 |
Consumer and other | Pass |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 248,632 |
Loans | 294,801 |  |  |
Consumer and other | Pass | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 0 |
Consumer and other | Watch |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 3,304 |
Loans | 15,617 |  |  |
Consumer and other | Watch | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | 13,521 |
Consumer and other | Substandard |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Total loans, excluding purchased credit impaired loans |  |  | 3,057 |
Loans | $ 5,466 |  |  |
Consumer and other | Substandard | Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans |  |  | $ 3,564 |

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